| 摘要 |
A system for the encryption of documents is described. A document, which may contain not only text, but also handwriting, pictures, charts, or other graphic images, is converted into a bitmap. This bitmap is encrypted and printed, preferably in a widely-spaced format for ease of subsequent processing, as an encrypted document. The encrypted document may then be copied or sent via facsimile machine as any other printed document, but without disclosing its contents to individuals other than the intended recipient. The encrypted document, or a replica thereof, is then scanned into a decryption device, which converts it into an encrypted bitmap, decrypts the encrypted bitmap, and displays or prints the decrypted document. Bitmap compression may optionally be used to reduce the size of the encrypted document.
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